Door control mechanism

ABSTRACT

A door control mechanism for controlling the movement of a onepiece door between the closed position and the open position thereof, wherein the door is biased toward the closed position thereof, the mechanism accommodating manual movement of the door to the open position followed by an automatic movement of the door to the closed position, followed by an automatic movement of the door to the open position, and then followed by a manual movement of the door to the closed position, the mechanism including a door bar pivotally mounted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, first latch mechanism having a door-barholding condition for holding the door in its open position and having a door-bar-releasing condition for permitting movement of the door to the closed position thereof, a door-driving device operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, a second latch mechanism having a device-connecting condition for connecting the door-driving device to the door and having a device-holding condition for maintaining the doordriving device out of operative connection with the door, a trigger for selectively operating the first and the second latch mechanisms and biasing means for selectively rendering the trigger operable to change the condition of only one of the first and the second latch mechanisms at one time.

llnited States Patent [72] lnventor Erwin B. Bahnsen Oakbrook, Ill.

[21] Appl. No. 872,131

[22] Filed Oct. 29, 1969 [45] Patented Jan. 4, 1972 [73] Assignee Steiner American Corporation Salt Lake City, Utah 54 noon CONTROL MECHANISM 28 Claims, 42 Drawing Figs.

[52] US. Cl. 49/200, 49/272, 49/379 [51] Int. Cl E05f 11/54, EOSf 13/00 [50] Field of 491197-200,

[5 6] References Cited UNITED STATES PATENTS 2,217,761 10/1940 Farlane et a1. 49/266 x 2,543,506 2/1951 Peters 49/267 2,621,038 12/1952 Boyd 49/200 2,985,446 5/1961 Marmont et al. 49/200 Primary Examiner-J. Karl Bell Attorney-Prangley, Clayton, Mullin, Dithmar & Vogel ABSTRACT: A door control mechanism for controlling the movement of a one-piece door between the closed position and the open position thereof, wherein the door is biased toward the closed position thereof, the mechanism accommodating manual movement of the door to the open position followed by an automatic movement of the door to the closed position, followed by an automatic movement of the door to the open position, and then followed by a manual movement of the door to the closed position, the mechanism including a door bar pivotally mounted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, first latch mechanism having a doorbar-holding condition for holding the door in its open position and having a door-bar-releasing condition for permitting movement of the door to the closed position thereof, a doordriving device operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, a second latch mechanism having a device-connecting condition for connecting the door-driving device to the door and having a device-holding condition for maintaining the door-driving device out of operative connection with the door, a trigger for selectively operating the first and the second latch mechanisms and biasing means for selectively rendering the trigger operable to change the condition of only one of the first and the second latch mechanisms at one time.

mtmanm 41972 (631,628

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DOOR CONTROL MECHANISM This invention is directed to a door control mechanism of the type useful with garage doors and the like, and particularly useful in combination with a one-piece door.

It is an important object of the present invention to provide an improved door control mechanism and an improved combination for use with an associated building having a doorreceiving opening therein, the combination comprising a door mounted in the door-receiving opening and movable between a first position and a second position with respect to the opening, counterbalance mechanism for mounting on the as sociated building adjacent to the door-receiving opening to counterbalance the door so that the door is biased toward the first position thereof, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the first and the second positions thereof, first latch mechanism having a door-bar-holding condition for holding the door bar in the position thereof corresponding to the second position of the door and a door-bar-releasing condition permitting movement of the door bar to the position thereof corresponding to the first position of the door, a doordriving device for the control mechanism and operative when connected to the door automatically to move the door from the first position thereof to the second position thereof, second latch mechanism having a device-connecting condition for connecting the door-driving device to the door to effect automatic operation thereof from the first position to the second position thereof and having a device-holding condition for maintaining the door-driving device out of operative connection with the door, whereby selective operation of the second latch mechanism to the device-connecting condition thereof effects automatic movement of the door to the second position thereof and selective operation of the first latch mechanism to the door-bar-releasing condition thereof and the second latch mechanism to the device-holding condition thereof effects automatic movement of the door to the first position thereof.

Another object of the present invention is to provide an improved door control mechanism and an improved combination of the type set forth, in which the door control mechanism includes a first latch member fixedly connected to the door bar for movement therewith, a second latch member mounted adjacent to the door bar for engagement with the first latch member, engagement of the first and second latch members holding the door in the second position thereof and disengagement of the first and second latch members releasing the door for movement to the first and second latch members releasing the door for movement to the first position thereof, a third latch member mounted on the door-driving device for movement therewith, a fourth latch member mounted adjacent to the door-driving device for engagement with the third latch member, engagement of the third and fourth latch members holding the door-driving device out of operative connection with the door and disengagement of the third and fourth latch members placing the door-driving device in operative connection with the door.

Another object of the present invention is to provide an improved door control mechanism and an improved combination of the type set forth in which the door is a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a first position and a second position with respect to the door.

Another object of the present invention is to provide an improved door control mechanism and an improved combination of the type set forth, in which the door is movable between a closed position and an open position thereof.

Another object of the present invention is to provide an improved door control mechanism and an improved combination of the type set forth, in which engagement and disengagement of the latch members effects automatic movement of the door between the closed and the open positions thereof.

Still another object of the present invention is to provide an improved door control mechanism and an improved combination of the type set forth, in which the door control mechanism includes a trigger selectively operable on the first latch mechanism for operating the first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on the second latch mechanism for operating the second latch mechanism between the device-connecting condition and the device-holding condition thereof.

Still another object of the present invention is to provide an improved door control mechanism and an improved combina tion of the type set forth, in which the door control mechanism includes a control element disposed in front of the doorreceiving opening and operatively connected to the trigger to activate the trigger in response to actuation of the control element upon a wheeled vehicle entering into and exiting from the associated building.

A further object of the present invention is to provide an improved door control mechanism and an improved combination of the type set forth, in which the door control mechanism includes means biasing the trigger into a first position for operating the first mechanism into the door-bar-holding condition thereof and said second latch mechanism into the device-releasing condition thereof, movement of the door bar to the position thereof corresponding to the open position of the door moving the trigger against the biasing means into a second position for operating the first latch mechanism into a door-bar-releasing condition and the second latch mechanism into the device-holding condition thereof.

A still further object of the present invention is to provide an improved door control mechanism and an improved combination of the type set forth, in which the door control mechanism includes a control element disposed in front of the door-receiving opening, the door control mechanism in the closed position of the door accommodating both manual opening of the door and automatic opening of the door by actuation of the control element, the door control mechanism in the open position of the door accommodating automatic closing of the door by actuation of the control element after a manual opening of the door. The invention, both as to its organization and method of operation, together with further objects and advantages thereof, will best be understood by reference to the following specification taken in connection with the accompanying drawings in which:

FIG. 1 illustrates an automobile in front of a garage having therein a garage door in a door-opening therein and including a door control mechanism incorporating the features of the invention;

FIG. 2 is a rear elevational view of the garage door of FIG. I as seen in the direction of the arrows along the line 2-2 thereof;

FIG. 3 is a view partly in section of the garage door of FIG. 2 in a closed position taken along line 3-3 thereof and particularly showing the counterbalance mechanism therefor;

FIG. 4 is a view partly in section of the garage door shown in FIG. 3 in the open position thereof;

FIG. 5 is a view partly in section of the garage door shown in FIG. 2 taken along line 5-5 thereof and particularly showing the door control mechanism therefor;

FIG. 6 is a rear elevational view of the door control mechanism shown in FIG. 5;

FIG. 7 is a side view partly in section of the garage door and the control mechanism therefor with certain portions removed for clarity and particularly showing the door in the closed position thereof;

FIG. 8 is a side view partly in section of the garage door and the control mechanism therefor shown in FIG. 7 and particularly showing the door in the open position thereof;

FIG. 9 is a side view partly in section of the garage door and the control mechanism therefor with certain other portions removed for clarity and particularly showing the door in the closed position thereof;

FIG. is a side view partly in section of the garage door and the control mechanism therefor shown in FIG. 9 and particularly showing the door in the open position thereof;

FIG. 11 is a perspective view with portions broken away of first and second latch mechanisms for the door showing the spatial relationship therebetween and with a trigger therefor;

FIG. 12 is an enlarged perspective view of the trigger for the latch mechanisms of FIG. 11;

FIG. 13 is a side elevational view of one of the latch mechanisms of FIG. 11 as viewed along line 1313 thereof;

FIG. 14 is a sectional view of the trigger of FIG. 12 taken along line 14-14 thereof;

FIG. 15 is a front elevational view partly in section of the latch mechanisms of FIG. 11 as viewed along line l5-l5 thereof;

FIGS. 16 to 18 are schematic and diagrammatic views of the door control mechanism showing the relative positions of the latch mechanisms, the door-driving device, the trigger, and the cams extending therefrom after the door has been manually closed;

FIGS. 19 to 21 are schematic and diagrammatic views of the door control mechanism showing the relative positions of the latch mechanisms, the door-driving device, the trigger, and the cams extending therefrom after the door has been manually opened;

FIGS. 22 to 24 are schematic and diagrammatic views of the door control mechanism showing the relative positions of the latch mechanisms, the door-driving device, the trigger and the cams extending therefrom when the front wheels ofa wheeled vehicle are on the control element;

FIGS. 25 to 27 are schematic and diagrammatic views of the door control mechanism showing the relative positions of the latch mechanisms, the door-driving device, the trigger and the cams extending therefrom after the front wheels of wheeled vehicle clear the control element;

FIGS. 28 to 30 are schematic and diagrammatic views of the door control mechanism showing the relative positions of the latch mechanisms, the door-driving device, the trigger and the cams extending therefrom when the rear wheels of a wheeled vehicle are on the control element;

FIGS. 31 to 33 are schematic and diagrammatic views ofthe door control mechanism showing the relative positions of the latch mechanisms, the door-driving device, the trigger and the cams extending therefrom after the door has been automatically closed;

FIGS. 34 to 36 are schematic and diagrammatic views ofthe door control mechanism showing the relative positions of the latch mechanisms, the door-driving device, the trigger and the cams extending therefrom when the front wheels ofa wheeled vehicles are on the control element and the door automatically is opened;

FIGS. 37 to 39 are schematic and diagrammatic views of the door control mechanism showing the relative positions of the latch mechanisms, the door-driving device, the trigger and the cams extending therefrom after the door has been automatically opened; and

FIGS. 40 to 42 are schematic and diagrammatic views ofthe door control mechanism showing the relative positions of the latch mechanisms, the door-driving device, the trigger and the cams extending therefrom after the door has been manually closed.

There is illustrated hereinafter a garage door 110 and a door control mechanism 200 including a door-lift bar 205 therefor which accommodates movement of the door 110 between a first (closed) and a second (open) position that includes a manual door-opening operation followed by an automatic door-closing operation and then by an automatic door-opening operation and thereafter by a manual door-closing operation. The door 110 has operatively connected thereto a counterbalance mechanism 160 and 230 to counterbalance the door 110 to either the first or the second position, the door control mechanism 200 being adapted to selectively add or subtract an additional force thereby to accomplish selective automatic movement of the door 110 from the first position to the second position and from the second position to the first position thereof.

With reference to the drawings and particularly F I65. 1 and 2 thereof, there is shown an automobile having two spaced-apart front wheels 101 and two spaced-apart rear wheels 102, the car 100 being positioned on the ground or driveway 103 in front of a garage 105. The garage 105 includes two spaced-apart upstanding sidewalls 106, a rear wall (not shown) interconnecting the sidewalls 106, a slanted roof or top wall 107, and a front wall 108 also interconnecting the two sidewalls 106. The front wall 108 has centrally located therein a door-receiving opening 109, the door-opening 109 being of sufficient height and width to receive therein an appropriate one-piece door 110 of the type for a one-car or a two-car garage.

There is shown, particularly in FIGS. 2 to 4, on the left-hand side of the door 110 as viewed in FIG. 2, standard hardware of the type readily adapted for use with a one-piece door of the type herein disclosed, the standard hardware 115 including a door-frame bracket fixedly connected to the front wall 108 of the garage 105 adjacent to the door-receiving opening 108 and positioned above the center of gravity of the door 110, the bracket 120 being formed of a single plate having a top edge 121 extending transversely rearwardly of the front wall 108, a bottom edge 102 spaced apart and generally parallel to the top edge 121 and a diagonally extending rear edge 123 extending from the top edge 121 forwardly and downwardly to the bottom edge 122. It is hereinafter noted that reference to the front of the rear of any apparatus hereinafter named is to that portion positioned closest to the front wall 108 or the rear ofthe garage 105, respectively. The standard hardware 115 further includes a stabilizing bar 125 interconnecting the door 110 with the door-frame bracket 120, the stabilizing bar 125 including a first leg 125a journaled for pivotal movement on a pivot shaft 126 extending transversely of the door-frame bracket 120 to the right as viewed in FIG. 2, a second leg 126a parallel to but offset from the first leg 125a and suitably journaled for rotation about a pivot shaft 127, the first leg 125a and the second leg 126a being interconnected by a diagonally extending leg 128. A stabilizing-bar bracket 130 positioned below the center of gravity of the door 110 is mounted to the door 110 and includes a transverse flange 131 carrying the pivot shaft 127 and an attachment flange 132 suitably fixedly mounted to the inside of the garage door 110.

The standard hardware 115 further includes a door bar 135 also interconnecting the door-frame bracket 120 with the door 110, the door bar 135 including a first leg 136, a second leg 137 offset to the left from and generally parallel to the first leg 136 and a transversely extending leg 138 interconnecting the first and second legs 136 and 137. A pivot shaft 140 extends transversely of the door-frame bracket 120 adjacent to the top edge 121 thereof, the door bar 135 being suitably journaled on the pivot shaft 140 for rotation with respect thereto and spaced therefrom by a spacer 141 positioned between the first leg 136 of the door bar 135 and the door-frame bracket 120 on the shaft 140. Adjacent to the bottom of the first leg 136 ofthe door bar 135, the door bar 135 is suitably journaled on a pivot shaft 143 for rotation with respect thereto, the pivot shaft 143 transversely extending from a door-lift-bar bracket 145 fixedly mounted on the door 110 at the center of gravity thereof, the bracket 145 having a flange 146 extending normal to the door 110 and carrying thereon the pivot shaft 143, the bracket 145 further including an attachment flange 147 suitably and fixedly secured to the door 110 at the center of gravity thereof. Connected to the door bar 135 adjacent to the top of the second leg 137 is a tension link 150, the tension link 150 including a first bar 151 and a second bar 152, the bars 151 and 152 being parallel and spaced apart and connected one to another by a pivot shaft 153 extending through an aperture in the top of the second leg 137 of the door bar 135 and at the bottom thereof by a shaft 154 suitably securing the first 160 is connected to the door 110 and the standard hardware 115, the spring 160 having a top end 161 suitably secured about the shaft 154 of the tension link 150 and having a bottom end 162 suitably secured to a connecting bar 165 fixedly secured to the front wall 108 of the garage 105 adjacent to the door-receiving opening 109, the connecting bar 165 having therein an eyelet 166 for receiving the bottom end 162 of the spring 160, tension in the coil spring 160 being adjusted by the position of the connecting bar 165 relative to the tension link 150.

There is further provided a door-frame bracket 170 mounted on the front wall 108 of the garage 105 adjacent to the right-hand side of the door-receiving opening 109, as viewed in FIG. 2. The door-frame bracket 170 is similar to the door-frame bracket 120, the door-frame bracket 170 being adapted for use with the door control mechanism 200 of the present invention. The door-frame bracket 170 is formed of a single plate having a transversely extending top edge 171, an offset edge 172 extending parallel to and spaced downwardly from the top edge 171, a bottom edge 173 also parallel to and spaced downwardly from the offset edge 172 and a diagonal edge 174 interconnecting the top edge 171 with the offset edge 172 with the bottom edge 173. Intermediate the top edge 171 and the ofi'set edge 172 of the door-frame bracket 170 is a stop pin 175 extending transversely of the bracket 170 toward the left-hand side of the door-receiving opening 109, the stop pin 175 being for a purpose hereinafter explained. Interconnecting the door 110 with the door-frame bracket 170 is a stabilizing bar 180, the bar 180 including a first leg 181 suitably journaled for pivotal movement on a pivot shaft 182 extending transversely of the bracket 170 adjacent to the offset edge 172 toward the left-hand side of the door-receiving opening 109, the stabilizing bar 180 further including a second leg 183 parallel to, ofiset and extending downwardly from the first leg 181, the legs 181 and 183 being interconnected therewith by a diagonally extending leg 184. The second leg 183 of the stabilizing bar 180 is journaled for pivotal movement about a pivot shaft 185 extending transversely from a stabilizingbar bracket 190 to the left of the door-receiving opening 109. The bracket 109 is mounted on the door 110 below the center of gravity thereof adjacent to the right-hand edge thereof, the bracket 170 including a flange 191 extending transversely of the door 110 toward the rear of the garage 105 and carrying thereon the pivot shaft 185 and an attachment flange 192 suitably secured to the door 110 by a plurality of bolts 193.

There is also provided, particularly as shown in the righthand portion of FIG. 2 and in FIGS. 5 and 6, a door control mechanism 200, the door control mechanism 200 being mounted on the righthand edge of the door 1 and the front wall 108 of the garage 105 adjacent to the door-receiving opening 109. it being understood that the door control mechanism 200 can be mounted adjacent to the lefbhand side of the door-receiving opening 109, it being a matter of preference. The door control mechanism 200 includes a door bar 205 interconnecting the door-frame bracket 170 with the door 110 similar to the door bar 135 provided on the left-hand side of the door 110, the door bar 205 on the right-hand edge of the door 110 including a first leg 206, a second leg 207 offset to the right from the first leg 206 and being parallel thereto, the first leg 206 and the second leg 207 being interconnected by a diagonal leg 208. The door bar 205 further includes a leg 211 extending transversely of the first leg 206 the top thereof to the right and a third leg 212 extending upwardly of the transverse leg 21 1, the third leg 212 being offset to the right and parallel to the first and second legs 206 and 207, the transverse leg 21 l of the door bar 205 being of longer horizontal extent than the transverse leg 138 of the door bar 135, for a purpose hereinafter to be explained. The door bar 205 is journaled on a main pivot shaft 215 for rotation with respect thereto, the main pivot shaft 215 215 being carried by the door-frame bracket 170 and extending horizontally to the left therefrom as shown in F IG. 2, the door bar 205 being prevented from axial movement along the main pivot shaft 215 by a spacer 216 and a spacer 217 positioned about the main pivot shaft 215 on each side of the door bar 205 and more particularly on either side of the first leg 206 of the door bar 205. The second leg 207 of the door bar 205 is journaled on a pivot shaft 218 for rotation thereabout, the door bar 205 being connected to the door 110 at the center of gravity thereof by a door bar bracket 220. The bracket 220 is positioned adjacent to the right-hand edge of the door 110 at the center of gravity thereof, the bracket 220 including a flange 221 extending transversely of the door 110 and carrying thereon the pivot shaft 218 and an attachment flange 222 extending normal to the transverse flange 221 and fixedly connected to the door 1 10 by a plurality of bolts 223.

There is further provided a tension link 225 pivotally connected to the third leg 212 of the door bar 205, the tension link 225 including a first bar 226 and a second bar 227 spaced from and parallel to the first bar 226, the first bar 226 and the second bar 227 being pivotally mounted to the third leg 212 of the door bar 205 by a pivot shaft 228 extending therethrough. The tension link 225 is connected at the bottom thereof by a shaft 229 fixedly securing the first bar 226 and the second bar 227 one to another, the bars 226 and 227 being so arranged to provide for pivotal movement of the tension link 225 with respect to the door bar 205. Also connecting bars 226 and 227 is a pin 226a which abuts the third leg 212 to limit the pivotal movement of link 225.

A counterbalance mechanism in the form of a coil spring 230 connects the tension link 225 and hence the door bar 205 and the door 110 with the front wall 108 of the garage 105, the spring 230 having a top end 231 formed into a hook suitably secured about the pivot shaft 229 of the tension link 225, the spring 230 having a bottom end 232 suitably secured to a connecting bar 235 having at the top end thereof an eyelet 236 for receiving the bottom end 232 of the spring 230. The bottom of the connecting bar 235 is fixedly secured to the front wall 108 of the garage adjacent to the door-receiving opening 109 and spaced to the right thereof, the connecting bar 235 being adjustable to vary the tension in the spring 230. It will be seen, therefore, that the counterbalance mechanisms 160 and 230 exert a counterbalancing force on the door due to the force exerted on the door by the coil springs to counterbalance the same toward either the open position or the closed position thereof depending upon the tension in the springs 160 and 230. While only one spring, such as spring 160, may be used as the counterbalance mechanism, two springs 160 and 230 are here illustrated, the two springs providing for a more evenly distributed force on the door 110.

As seen particularly in FIGS. 3 and 4, the door 110 is shiftable and pivotable between an open position and a closed position, the closed position being that in which the top of the door 110 rests against the front wall 105 above the doorreceiving opening 109 and the open position being that in which the door bars and 205 connected to the door 110 have pivoted therewith and with respect to the door 110 to open the same, the door 110 being prevented from yawing or rocking during the opening or closing thereof due to the combination of the door bars 135 and 205 and the stabilizing bars 125 and 180, the four pivot points 126, 127, and 143 on the left-hand or standard hardware 115 and the pivot points 182, 185, 215 and 218 on the right-hand hardware combining to stabilize the door 1 10 during the movements thereof.

There is further provided, as shown in FIGS. 5 to 8, 11 and 13, a first latch mechanism 240, the first latch mechanism 240 being positioned at the right-hand side of the door 110 and including a first latch member 245 in the form of an arm extending rearwardly of the door bar 205 and being integral therewith. The first latch member 245 having an abutment surface 246 at the distal end thereof formed along a straight edge extending from the center of the main pivot shaft 215 and having a camming surface 247 on the side of the latch member 245 opposite the abutment surface 246, the camming surface 247 also being positioned at the distal end of the latch member 245 away from the pivot shaft 215. The latch member 245 further carries on the right-hand side thereof intermediate the distal end and the pivot shaft 215 a positioning lug 248, the lug 248 being for a purpose hereinafter explained.

The first latch mechanism 240 further includes a second latch member 250, the second latch member 250 extending rearwardly from the front wall 108 and being pivotal with respect thereto, the second latch member 250 being in the form of a U-shaped member having a first upstanding leg 251, a second upstanding leg 252 parallel to and spaced apart from the first leg 251 and a web 253 interconnecting the first leg 251 and the second leg 252 at the bottom thereof. The second latch member 250 has at the front thereof adjacent to the front wall 108 of the garage 10S aligned pivot holes 255, one of the pivot holes 255 being in each of the legs 251 and 252 respectively. The second latch member 250 is tapered from a front portion 256 to a rear portion 257, the front portion 256 being smaller than in vertical extent the rear portion 257, the second latch member 250 carrying toward the front portion 256 thereof in the second leg 252 an eyelet 258, the eyelet 258 receiving therein a spring 259. The spring 259 is connected to the front wall 108 thereby to bias the second latch member 250 into an engagement position with the first latch member 245 as hereinafter explained. The second latch member 250 further includes toward the rear portion 257 thereof a roller 260, the roller 260 being suitably journaled on a pivot shaft 261 extending between the legs 251 and 252 to pivotally carry the same, the roller 260 being for engagement with the abutment surface 246 of the first latch member 245 for a purpose hereinafter explained.

The second latch member 250 further includes toward the rear portion 257 thereof in the leg 252, a cam-receiving opening 265, the cam-receiving opening 265 being L-shaped and having a forwardly extending leg 266 formed at the bottom thereof by an abutment surface 267 and a lower leg 268. A pawl 270 is positioned adjacent to the cam-receiving opening on the leg 252 of the second latch member 250, the pawl 270 having an abutment surface 271 extending into the camreceiving opening 250 beyond the forwardly extending leg 266 and abutment surface 267 thereof, the pawl 270 being suitably journaled on a pivot shaft 272 extending transversely of the leg 252 for pivotal movement thereabout and a stop pin 273 positioned below the pawl 270 for maintaining the pawl 270 in the position shown in FIG. 13, all for a purpose hereinafter explained.

The door control mechanism 200 further includes a stop shelf 275, the stop shelf 275 being fixedly connected to the front wall 208 of the garage 105 and extending transversely thereof toward the rear of the garage 105. The stop shelf 275 is positioned above the second latch member 250 to prevent the spring 259 from biasing the second latch member 250 beyond the horizontal position thereof, the shelf 275 having an abutment surface 276 on the bottom thereof contacting the top of the second latch member 250 in the horizontal position thereof thereby to prevent the second latch member 250 from being biased by the spring 259 to a position upwards of the horizontal position.

FIGS. 7 and 8 particularly show the relationship between the first latch mechanism 240 and the door 110 in the open and the closed position thereof. The first latch mechanism 240 is movable between a door-bar-holding condition and a doorbar-releasing condition. In the door-bar-releasing condition of the first latch mechanism 240, as seen in FIG. 7, the abutment surface 246 of thefirst latch member 245 is out of engagement with or disengaged from the roller 260 of the second latch member 250, thereby to permit the door bar 205 to assume the position thereof corresponding to the closed position of the door 110. In the door-bar-holding condition of the first latch mechanism 240, as seen in FIG. 8, the abutment surface 246 of the first latch member 245 is in engagement with the roller 260 of the second latch member 250, thereby to latch the door bar 205 and hence the door 110 into a position of the door bar 205 corresponding to the open position of the door 110. When the first latch mechanism 240 is in the door-barholding condition thereof and the first latch member 245 is in engagement with the second latch member 250, the door 110 is prevented from moving in the counterclockwise direction to the closed position thereof under the urging of gravity.

The door control mechanism 200 further includes a doordriving device 280, the door-driving device 280, as seen in FIGS. 5, 6, 9 and 10, is positioned for rotation about the main pivot shaft 215 and includes a weight 285 fixedly connected to a shaft 286, the shaft 286 having at the distal end thereof from the weight 285 an arcuate portion 287 fixedly connected to a bushing 288 suitably journaled on for rotation with respect to the main pivot shaft 215. It is seen therefore, that the doordriving device 280 is journaled for rotation about the main pivot shaft 215 but is not connected thereto for fixed rotation therewith.

The door control mechanism 200 further includes a second latch mechanism 290 as seen in FIGS. 9 to 11, the second latch mechanism 290 including a third latch member 295 in the form of an arm fixedly connected to the bushing 288 and extending therefrom in a direction somewhat opposite to the shaft 286 carrying thereon the weight 285, the third latch member 295 including an abutment surface 296 formed along a straight edge passing through the center of the pivot shaft 215 and a camming surface 297 on the opposite side of the third latch member 295 from the abutment surface 296. It is seen therefore, that the third latch member 295 is fixed for free rotation with respect to the pivot shaft 215 and is fixed for rotation with the weight 285 about the pivot shaft 215.

The door control mechanism 200 is further provided with a fourth latch member 300, the fourth latch member 300 being similar in shape to the second latch member 250, the fourth latch member 300 being formed of a U-shaped member including a first upstanding leg 301, a second upstanding leg 302 parallel to and spaced apart from the first leg 301 and a web 303 interconnecting the legs 301 and 302 at the bottom thereof. The fourth latch member 300 also includes two pivot holes 305 being aligned one with the other in each of the legs 301 and 302 the pivot holes 305 being positioned toward the front of the fourth latch member 300. The fourth latch member 300 is tapered from a front portion 306 towards a rear portion 307 thereof, the rear portion 307 having a larger vertical extent than the front portion 306, the leg 302 carrying in the front portion 306 thereof an eyelet 308. The eyelet 308 receives therein a spring 309 fixedly connected to the front wall 108 of the garage thereby to bias the fourth latch member 300 into an engagement position with the third latch member 295 as hereinafter explained. The stop shelf 275 prevents movement of the fourth latch member 300 beyond the horizontal position thereof in the same manner as with the second latch member 250, the abutment surface 276 contacting the fourth latch member 300 to prevent further upward movement thereof. The fourth latch member 300 further includes a roller 310 suitably journaled on a pivot shaft 311 in the rear portion 307 of the fourth latch member 300, the roller 310 being for engagement with the abutment surface 296 of the third latch member 295 for a purpose hereinafter explained.

The fourth latch member 300 further includes in the leg 302 toward the rear portion 307 thereof a cam-receiving opening 315, the cam-receiving opening 315 being L-shaped and including a rearwardly extending leg 316 formed at the bottom thereof by an abutment surface 137 and a lower leg 318. It is here noted that the cam-receiving opening 315 is similar in shape to the cam-receiving opening 265 but is reversed with respect thereto. The second latch member 250 and the fourth latch member 300 are mounted for pivotal movement with respect to the front wall 108 of the garage 105 and the first latch member 245 and the third latch member 295 by a pivot shaft 320 extending through the aligned apertures 255 and 305 in the latch members 250 and 300 respectively, the pivot shaft 320 having at the left-hand edge and the right-hand edge thereof a stop head 321 for holding the latch members 250 and 300 against axial movement therealong and a bearing 322 positioned adjacent to the door-frame bracket 170 carrying the pivot shaft 320 transversely thereof.

FIGS. 9 and 10 particularly show the relationship between the door-driving mechanism 280, the third latch member 295 and the fourth latch member 300 forming the second latch mechanism 290 when the door 110 is in the closed position thereof and the open position thereof. The second latch mechanism 290 is movable between a device-holding condition and a device-connecting condition. In the device-holding condition of the second latch mechanism 290, as seen in FIG. 9; the abutment surface 296 of the third latch member 295 is in engagement with the roller 310 of the fourth latch member 300, thereby to prevent clockwise rotation of the door-driving device 280 and maintain the door-driving device 280 out of operative connection with the door 110. In the device-connecting condition of the second latch mechanism 290, as seen in FIG. 10, the abutment surface 296 of the third latch member 295 is out of engagement with or disengaged from the roller 310 of the fourth latch member 300, thereby to permit rotation of the door'driving device 280 in the clockwise direction and to operatively connect the door-driving device 280 to the door 110 automatically to move the door 1 10 from the closed to the open position thereof. When the door 110 is in the open position thereof, the third latch member 295 engages the stop pin 175 extending transversely of the doorframe bracket 170, thereby to prevent the first latch member 245 from engaging the second latch member 250 for a purpose hereinafter explained. It is seen therefore, that the second latch mechanism 290 is movable between a deviceholding condition in which the third latch member 295 is in engagement with the fourth latch member 300 thereby to prevent movement of the door-driving device 280 and a device-connecting condition in which the third latch member 295 is out of engagement with the fourth latch member 300, thereby to permit rotation of the door-driving device 280 in a clockwise direction thereby drivingly to engage the transverse leg 211 of the door bar 205 and to drive the same in a clockwise direction thereby to move the door 110 from the closed position thereof to the open position thereof.

There is further provided a trigger 330 in the form of an elongated bar positioned between the second latch member 250 and the fourth latch member 300, the trigger 330 being tapered from a bottom portion 331 thereof to a top portion 332 thereof, the bottom portion 331 being smaller in transverse extent than the top portion 332. The trigger 330 has in the bottom portion 331 thereof a pivot hole 333 and spaced upwardly from the pivot hole 333 an eyelet 334. Extending upwardly from the top portion 332 of the trigger 330 is a leaf spring 335 carrying on the top thereof a cam follower 336, the cam follower 336 being vertically positioned to be engaged by the positioning lug 248 on the first latch member 245 for a purpose hereinafter to be explained. Spaced below the leaf spring 335 and formed from the trigger 330 are two cams 340 and 345 extending outwardly from the trigger 330, the cams 340 and 345 being particularly shown in FIG. 14 and extend ing at an angle of about 180 from each other, the cam 340 being so positioned on the trigger 330 to extend within the cam-receiving opening 265 of the second latch member 250 and the cam 345 being so positioned on the trigger 330 to ex-' tend into the cam-receiving opening 315 of the fourth latch member 300. The trigger 330 is biased toward the rear of the garage 105 by a spring 347 fixedly connected at one end thereof to the eyelet 334 in the trigger 330 and at the other end thereof to a brace member 348 extending outwardly toward the rear of the garage 105 from the front wall 103.

it is seen therefore, that the trigger 330 is movable between a first position and a second position, the first position of the trigger 330 being with the lug 345 thereof over the abutment surface 317 of the cam-receiving opening 315 and the lug 340 in the cam-receiving opening 265 over the lower leg 268 thereof Downward movement of the trigger 330 in the first position thereof will place the first latch mechanism 240 in the door-barholding condition thereof and the second latch mechanism 290 in the device-connecting condition thereof. Engagement of the cam follower 336 by the positioning lug 248 on the first latch member 245 as the door bar 205 moves to the position thereof corresponding to the open position of the door 110 moves the trigger 330 against the biasing means or spring 347 into the second position in which the lug 345 in the cam-receiving opening 315 is positioned over the lower leg 310 thereof and the lug 340 in the cam-receiving opening 365 of the second latch member 250 is positioned over the abut ment surface 267 of the opening 265. Downward movement of the trigger 330 in the second position thereof places the first latch mechanism 240 in the door-bar-releasing condition thereof and the second latch mechanism 290 in the deviceholding condition thereof.

The door control mechanism 200 further includes an hydraulic system 360 positioned below the trigger 330 and operatively connected thereto, the hydraulic system 360 including a cylinder 361, particularly as shown in FIGS. 1 and 6, and a piston stem 362 extending upwardly therefrom and connected to the trigger 330 by a pivot shaft 363 forming a portion of a U-shaped connecting member 364, the shaft 363 extending through the pivot hole 333 of the trigger 330 thereby operatively to connect the trigger 330 with the hydraulic system 360. Extending outwardly from the cylinder'361 of the hydraulic system 360 is a hose 365, the hose 365 connecting the hydraulic cylinder 361 with a control element 370 extending transversely across the driveway 103 in front of the doorreceiving opening 109 of the garage 105. Actuation of the hydraulic system 360 by positioning the front wheels 101 or the rear wheels 102 of the automobile on the control element 370 results in a downward movement of the piston stem 362 thereby to carry therewith the trigger 330, all for a purpose hereinafter explained.

The operation of the door 110 through a complete cycle consisting of a manual door-opening, followed by an automatic door-closing, followed by an automatic door-opening, followed by a manual door-closing, will hereinafter be explained. After the door 110 has been manually closed, the door control mechanism 200 is in the position shown in FIGS. 16 to 18, inclusive. The first latch mechanism 240 is in the door-bar-releasing condition thereof in which the first latch member 245 is out of engagement with the second latch member 250, the second latch mechanism 240 is in the device-holding condition thereof in which the third latch member 295 is in engagement with the fourth latch member 300, thereby to prevent rotation of the door-driving device 280 in the clockwise direction. The trigger 330 is biased to its first position by the spring 347, thereby to position the cam 340 in the cam-receiving opening 265 over the lower leg 268 thereof and the cam 345 in the cam-receiving opening 315 in the rearwardly extending leg 316 over the abutment surface 317 thereof.

After the door has been manually opened, the door control mechanism 200 is in the position shown in FIGS. 19 to 21, inclusive. The first latch mechanism 240 is in the door-bar-holding condition thereof because the first latch member 245 has been rotated in the clockwise direction upon the opening of the door 110 so that the camming surface 247 has caused the second latch member 250 to pivot downwardly about the pivot shaft 320 until the camming surface 247 passes thereby; thereafter, the biasing means 259 biases the second latch member 250 to its engagement position wherein the abutment surface 246 of the first latch member 245 engages the roller 260 of the second latch member 250 thereby to latch the door 110 in the open position thereof and to prevent rotation of the door bar 205 thereby the door 110 in a counterclockwise direction. When the first latch mechanism 240 is in the doorbar-holding condition thereof in which the first latch member 245 is in engagement with the second latch member 250, the positioning lug 248 on the first latch member 245 engages the cam follower 336 on the distal end of the leaf spring 335 thereby to move the trigger 330 against the biasing means 347 to the second position of the trigger 330 in which the cam 340 in the cam-receiving opening 265 of the second latch member 250 is driven toward the forwardly extending leg 266 of the opening 265; however, the presence of the pawl 270 prevents movement of the cam 340 completely to the left as shown in FIG. 21, whereby the cam 340 contacts the abutment surface 271 of the pawl 270 to halt movement of the cam 340 to a position over the abutment surface 267. The cam 345 in the cam-receiving opening 315 of the fourth latch member 300 is positioned over the lower leg 318 of the opening 315.

When the automobile 100 is driven out of the garage 105, the rear wheels 102 contact the control element 370 thereby to actuate the hydraulic system 360 and to pull the piston stem 362 downwardly and thereby the trigger 330. When the rear wheels 102 of the automobile 100 are on the control element 370, the door control mechanism 200 is in the position shown in FIGS. 22 to 24, inclusive. The first latch mechanism 240 remains in the door-holding condition thereof in which the first latch member 245 is in engagement with the second latch member 250, and the second latch mechanism 290 remains in the device-holding condition thereof in which the third latch member 295 is in engagement with the fourth latch member 300. The trigger 330 is moved downwardly, thereby to move the cam 340 away from the abutment surface 271 of the pawl 270 into the lower leg 268 of the cam-receiving opening 265 in the second latch member 250. Since the positioning lug 248 on the first latch member 245 still is engaged by the cam follower 336, the trigger 330 is biased against the spring 347 and the cam 340 moves toward the front wall 108 of the garage 105 or to the left, as shown in the FIGS, and the cam 345 in the cam-receiving opening 315 of the fourth latch member 300 is moved to the left and downwardly into the lower leg 318 of the opening 315.

After the rear wheels 102 of the automobile 100 clear the control element 370, the door control mechanism 200 is in the position shown in FIGS. 25 to 27, inclusive. The first latch mechanism 240 remains in the door-bar-holding condition thereof in which the first latch member 245 is in engagement with the second latch member 250, and the second latch mechanism 290 is in the device-holding condition thereof in which the third latch member 295 is in engagement with the fourth latch member 300. The trigger 330 rises upwardly due to the action of the return spring (not shown) in the cylinder 361 thereby to position the cam follower 366 against the positioning lug 248 carried on the first latch member 245. The cam 340 rises upwardly with the trigger 330 and underneath the pawl 270 to pivot the same about the pivot shaft 272 thereby to position the cam 340 on the abutment surface 267 in the forwardly extending leg 266 of the cam-receiving opening 265 in the second latch member 250. The cam 345 in the cam-receiving opening 315 of the fourth latch member 300 is positioned over the lower leg 318 of the opening 315.

When the front wheels 101 of the automobile 100 actuate the control element 370 the door control mechanism assumes the position shown in FIGS. 28 to 30, inclusive. The first latch mechanism 240 moves from the door-bar-holding condition thereof to the door-barreleasing condition thereof in which the second latch member 250 is pivoted downwardly in response to the movement of the trigger 330 to disengage the first latch member 245 thereby to allow movement of the door bar 205 and the first latch member 245 in a counterclockwise direction, whereby the door 110 which is biased to the closed position thereof under the urging of gravity moves from the open position to the closed position thereof. The second latch mechanism 290 remains in the device-holding condition thereof in which the third latch member 295 is in engagement with the fourth latch member 300 thereby to prevent clockwise rotation of the door-driving device 280. The trigger 330 moves downwardly in response to actuation of the control element 370 and the movement of the piston stem 362 to selectively pivot the second latch member 250 about the pivot shaft 320 due to the action of the cam 340 on the abutment surface 267 of the cam-receiving opening 265 in the second latch member 250. The fourth latch member 300 is unaffected by the downward movement of the trigger 330 because the cam 345 is positioned over the lower leg 318 of the camreceiving opening 315 in the fourth latch member 300 whereby downward movement of the trigger 330 does not cause pivoting of the fourth latch member 300 about the pivot shaft 320 to cause disengagement of the fourth latch member 300 and the third latch member 295.

After the front wheels 101 of the automobile clear the control element 370, the hydraulic system 360 returns the trigger 330 to its uppermost position and the door control mechanism 200 assumes the position shown in FIGS. 31 to 33, inclusive. The first latch mechanism 240 is in the door-barreleasing condition thereof in which the first latch member 245 is out of engagement with the second latch member 250 and the positioning lug 248 carried by the first latch member 245 is out of contact with the cam follower 336. The second latch mechanism 290 remains in the device-holding condition thereof in which the third latch member 295 is in engagement with the fourth latch member 300 thereby to prevent clockwise rotation of the door-driving device 280. Since the positioning lug 248 is out of contact with the cam follower 336, the trigger 330 moves to its first position under the urging of the spring 347 thereby to position the cam 340 in the camreceiving opening 265 in the second latch member 250 over the lower leg 268 of the opening 265 and the cam 345 is positioned over the abutment surface 317 of the rearwardly extending leg 316 ofthe cam-receiving opening 315 in the fourth latch member 300.

When the automobile 100 approaches the garage 105 and the front wheels 101 actuate the control element 370, the door automatically opens and the door control mechanism 200 assumes the position shown in FIGS. 34 to 36. The first latch mechanism 240 remains in the door-bar-releasing condition thereof in which the first latch member 245 is out of engagement with the second latch member 250, and the second latch mechanism 290 assumes the device'connecting condition thereof in which the third latch member 295 is out of engagement with the fourth latch member 300. The trigger 330 has been moved downwardly in response to actuation of the hydraulic system 360, thereby to position the cam 340 in the lower leg 268 of the cam-receiving opening 265 in the second latch member 250 so as not to pivot the latch member 250. The cam 345 positioned above the abutment surface 317 forming the rearwardly extending leg 316 of the cam-receiving opening 315 in the fourth latch member 300 pivots the fourth latch member 300 downwardly about the pivot shaft 320 thereby to cause disengagement of the third latch member 295 and the fourth latch member 300 and to place the second latch mechanism 290 in the device-connecting condition thereof. With the second latch mechanism 290 in the deviceconnecting condition thereof in which the third latch member 295 is out of engagement with the fourth latch member 300, the door-driving device 280 is free to rotate about the main pivot shaft 215 in a clockwise direction and upon rotation of the door-driving device 280, the shaft 286 thereof engages the transversely extending leg 211 of the door bar 205 thereby to cause the door bar 205 to rotate in the clockwise direction and hence the door 110 pivotally connected to the door bar 205 shiftably and pivotally to move from the closed position to the open position thereof. Engagement of the first latch member 245 and the second latch member 250 is prevented by engagement of the abutment surface 296 of the third latch member 295 with the stop pin extending from the door-frame bracket 170, the stop pin 175 being positioned such that the first latch mechanism 240 remains in the door-bar-releasing condition thereof with the camming surface 247 of the first latch member 245 abutting the second latch member 250 but not pivoting the same downwardly thereby to prevent engagement of the abutment surface 246 of the first latch member 245 and the roller 210 of the second latch member 250 so as not to latch the door 110 open and to allow a subsequent manual closing without unlatching the first latch mechanism 240.

After the door 110 is in the automatically opened position thereof, the door control mechanism 200 is in the position shown in FIGS. 37 to 39, inclusive. The first latch mechanism 240 remains in the door-bar-releasing condition thereof in which the abutment surface 246 of the first latch member 245 is out of engagement with the roller 210 of the second latch member 250, and the second latch mechanism 290 is in the device-connecting condition thereof in which the third latch member 295 is out of engagement with the fourth latch member 300. The trigger 330 is in its uppermost position after the front wheels 101 clear the control element 370 and the cam 340 is positioned in the cam-receiving opening 265 over the lower leg 268 thereof in the second latch member 250 and the cam 345 in the cam-receiving opening 315 is positioned over the abutment surface 317 thereof due to the action of the spring 347 biasing the trigger 330 to its first position. Upon actuation of the control element 370 by the rear wheels !02 of the automobile 100 the trigger 330 is again moved downwardly thereby to pivot the fourth latch member 300 about the pivot shaft 320 as shown in FIG. 36; however, the movement of the fourth latch member 300 has no effect on the position of the door-driving device 250 and, therefore, actuation of the control element 370 when the door 1 is in the automatically open position thereof has no effect on the door 110 or in the ultimate function of the door control mechanism 200.

After a manual closing of the door 110, the door control mechanism is in the position shown in FIGS. 40 to 42, inclusive. The first latch mechanism 240 is in the door-bar-releasing condition thereof in which the first latch member 245 is out of engagement with the second latch member 250. The second latch mechanism 290 is in the device-holding condition thereof in which the third latch member 295 is in engagement with the fourth latch member 300. The manual movement of the door 110 from the open position to the closed position has caused the door bar 205 to rotate in the counterclockwise direction and the transverse leg 21] of the door bar 205 carries therewith the door-driving device 280 also in a counterclockwise direction to the position illustrated in FIG. 40. The camming surface 297 of the third latch member 295 contacts the roller 310 of the fourth latch member 300 thereby to pivot the fourth latch member 300 downwardly about the pivot shaft 320 and thereafter the action of the spring 322 raises the fourth latch member 300 to its normal horizontal position whereby the abutment surface 296 of the third latch member 295 engages the roller 310 of the fourth latch member 300 to place the second latch mechanism in the device-holding condition thereof. The trigger 330 is in its uppermost position and biased to its first position thereof under the action of the spring 347 in which the cam 340 in the camreceiving opening 265 in the second latch member 250 is positioned over the lower leg 268 of the opening 265 and the cam 345 in the cam-receiving opening 315 in the fourth latch member 300 is positioned over the abutment surface 317 forming the rearwardly extending leg 316 of the opening 315.

It is seen therefore, that the position of the door control mechanism 200 is the same whether the door 110 has been automatically closed, see FIGS. 31 to 33, or whether the door 110 has been manually closed, see FIGS. 40 to 42, and therefore, the door control mechanism 200 in the closed position of the door 110 accommodates both manual opening of the door 110 and automatic opening of the door 110 by actuation of the control element 370. The door control mechanism 200 in the open position of the door 110 accommodates both a manual closing of the door 110 and an automatic closing of the door 110 by actuation of the control element 370 after a manual opening of the door, all as hereinbefore explained.

As hereinbefore illustratedjhe door control mechanism 200 cooperates with the counterbalance mechanisms 160 and 230 to operate the door between a first (closed) position and a second (open) position, the door 110 as hereinbefore described being biased to the closed position thereof and moved to the open position thereof by selective operation of the trigger 330 on the first latch mechanism 240 and the second latch mechanism 290, but it is herein contemplated that the door 110 be biased to the open position thereof and the door control mechanism 200 be so adapted that upon selective operation thereof, the door 110 automatically will be moved to the closed position thereof.

In view of the foregoing, it is apparent that there has been provided an improved door control mechanism and an improved combination for use with an associated building having a door-receiving opening therein for shiftably and pivotaily operating a door between the closed position and the open position thereof. While there has been described what is at present present considered to be the preferred embodiment of the invention, it will be understood that various modifications may be made therein and it is intended to cover in the a pended claims all such modifications as fall within the true spirit and scope of the invention.

What is claimed is:

l. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a door mounted in the doorreceiving opening and movable between a first position and a second position with respect to the opening, counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the first position thereof, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the doorreceiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the first and the second positions thereof, first latch mechanism having a door-bar-holding condition for holding said door bar in the position thereof corresponding to the second position of said door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the first position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the first position thereof to the second position thereof, second latch mechanism having a device-connecting condition for connecting said doordriving device to said door to effect automatic operation thereof from the first position to the second position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, whereby selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the second position thereof and selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the first position thereof.

2. The combination set forth in claim 1, wherein said first position of said door is a closed position with respect to the opening and said second position of said door is an open position with respect to the opening.

3. The combination set forth in claim 1, wherein said doordriving device includes a mass of sufficient weight automatically to move said door from the first position thereof to the second position thereof when operatively connected to said door.

4. The combination set forth in claim 1, wherein said doordriving device bears against said door bar when said second latch mechanism is in the device-connecting condition thereof.

5. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a door mounted in the door-receiving opening and movable between a first position and a second position with respect to the opening, counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the first position thereof, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the doorreceiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the first and the second positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding said door in the second position thereof and disengagement of said first and second latch members releasing said door for movement to the first position thereof, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the first position thereof to the second position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with said door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with said door, whereby disengagement of said first and second latch members together with engagement of said third and fourth latch members effects automatic movement of said door to the first position thereof and disengagement of said third and fourth latch members effects automatic movement of said door to the second position thereof and engagement of said first and second latch members holding said door in the second position thereof.

6. The combination set forth in claim 5, wherein said second latch member is pivotable between an engagement position with said first latch member and a disengagement position with said first latch member.

7. The combination set forth in claim 5, wherein said fourth latch member is pivotable between an engagement position with said third latch member and a disengagement position with said third latch member.

8. The combination set forth in claim 5, wherein said second latch member and said fourth latch member are pivotable about a common axis.

9. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, first latch mechanism having a door-bar-holding condition for holding said door bar in the position thereof corresponding to the open position of said door and a door-barreleasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a deviceconnecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, whereby selective operation of said second latch mechanism to the device-connecting condition thereof efiects automatic movement of said door to the open position thereof and selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof.

10. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding said door in the open position thereof and disengagement of said first and second latch members releasing said door for movement to the closed position thereof, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with said door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with said door, whereby disengagement of said first and second latch members together with engagement of said third and fourth latch members effects automatic movement of said door to the closed position thereof and disengagement of said third and fourth latch members effects automatic movement of said door to the open position thereof and engagement of said first and second latch members holding said door in the open position thereof.

11. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, first latch mechanism having a door-bar-holding condition for holding said door bar in the position thereof corresponding to the open position of said door and a door-barreleasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a deviceconnecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, and a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-barholding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the device-connecting condition and the device-holding condition thereof, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof efiects holding of said door in the open position thereof.

12. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding said door in the open position thereof and disengagement of said first and second latch members releasing said door for movement to the closed position thereof, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with said door and disengagement of said third and fourth latch members placing said doordriving device in operative connection with said door, a trigger selectively operable on said second and fourth latch members to move said second and fourth latch members into and out of engagement with said first and third latch members respectively, whereby operation ofsaid trigger to cause disengagement of said first and second latch members and engagement of said third and fourth latch members effects automatic movement of said door to the closed position thereof and operation of said trigger to cause disengagement of said third and fourth latch members effects automatic movement of said door to the open position thereof and operation of said trigger to cause engagement of said first and second latch members efiects holding of said door in the open position thereof.

13. The combination set forth in claim 12, wherein said trigger is positioned between said second and fourth latch members.

14. The combination set forth in claim 12, wherein said second latch member and said fourth latch member each have an opening therein respectively to receive a portion of said trigger.

15. The combination set forth in claim 12, wherein said trigger has extending therefrom two outwardly disposed cams, said cams extending at an angle of about from each other, said trigger being positioned between said second and said fourth latch members, said second and said fourth latch members each having therein an opening respectively to receive a cam extending outwardly from said trigger.

16. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, first latch mechanism having a door-bar-holding condition for holding said door in the position thereof corresponding to the open position of said door and a door-barreleasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a deviceconnecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to.the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the deviceconnecting condition and the device-holding condition thereof, and a control element for said mechanism disposed in front of the door-receiving opening and operatively connected to said trigger to activate said trigger in response to actuation of said control element upon a wheeled vehicle entering into or exiting from the associated building, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of said door in the open position thereof.

17. The combination set forth in claim 16, wherein said control element is hydraulically operated, thereby to activate said trigger in response to movement of hydraulic fluid in said control element.

18. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a onepiece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, first latch mechanism having a door-bar holding condition for holding said door bar in the position thereof corresponding to the open position of said door and a door-barreleasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a deviceconnecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the deviceconnecting condition and the device-holding condition thereof, means biasing said trigger into a first position for operating said first latch mechanism into the door-bar-holding condition thereof and said second latch mechanism into the device-connecting condition thereof, movement of said door bar to the position thereof corresponding to the open position of said door moving said trigger against said biasing means into a second position for operating said first latch mechanism into the door-bar-releasing condition thereof and said second latch mechanism into the device-holding condition thereof, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the doorbar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of said door in the open position thereof.

19. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to thedoor-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, said door control mechanism including a control element therefor disposed in front of the door-receiving opening, said door control mechanism in the closed position of said door accommodating both manual opening of said door and automatic opening of said door by actuation of said control element, said door control mechanism in the open position of said door accommodating both manual closing of said door and automatic closing of said door by actuation of said control element after a manual opening of said door, said door control mechanism including means for rendering any actuation of said control element ineffective to change the position of said door subsequent to an automatic opening thereof.

20. A door control mechanism for use with a door mounted in an associated building having a door-receiving opening therein to accommodate a manual movement of the door from a first position to a second position thereof followed by an automatic movement of the door from the second position to the first position thereof under the urging of a biasing means and then by an automatic movement of the door from the first position to the second position thereof and then by a manual movement of the door from the second position thereof to the first position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the first and the second positions thereof, first latch mechanism having a doorbar-holding condition for holding the door in the position thereof corresponding to the second position of the door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the first position of the door, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the first position thereof to the second position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to the door to effect automatic operation thereof from the first position to the second position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with the door, whereby selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of the door to the second position thereof and selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of the door to the first position thereof.

21. A door control mechanism for use with a door mounted in an associated building having a door-receiving opening therein to accommodate a manual movement of the door from a first position to a second position thereof followed by an automatic movement of the door from the second position to the first position thereof under the urging of a biasing means and then by an automatic movement of the door from the first position to the second position thereof and then by a manual movement of the door from the second position thereof to the first position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the first and the second positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding the door in the second position thereof and disengagement of said first and second latch members releasing the door for movement to the first position thereof, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the first position thereof to the second position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with the door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with the door, whereby disengagement of said first and second latch members together with engagement of said third and fourth latch members effects automatic movement of the door to the first position thereof and disengagement of said third and fourth latch members effects automatic movement of the door to the second position thereof and engagement of said first and second latch members holding the door in the second position thereof.

22. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, first latch mechanism having a doorbar-holding condition for holding said door bar in the position thereof corresponding to the open position of the door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of the door, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to the door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with the door, whereby selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of the door to the open position thereof and selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of the door to the closed position thereof.

23. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receivin'g opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding the door in the open position thereof and disengagement of said first and second latch members releasing the door for movement to the closed position thereof, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with the door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with the door, whereby disengagement of said first and second latch members together with engagement of said third and fourth latch members effects automatic movement of the door to the closed position thereof and disengagement of said third and fourth latch members effects automatic movement of the door to the open position thereof and engagement of said first and second latch members holding the door in the open position thereof.

24. A door control mechanism for use with a one piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, first latch mechanism having a doorbar-holding condition for holding said door bar in the position thereof corresponding to the open position of the door and a 'door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of the door, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to the door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with the door, and a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the deviceconnecting condition and the device-holding condition thereof, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of the door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of the door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of the door in the open position thereof.

25. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding the door in the open position thereof and disengagement of said first and second latch members releasing the door for movement to the closed position thereof, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with the door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with the door, a trigger selectively operable on said second and fourth latch members to move said second and fourth latch members into and out of engagement with said first and third latch members respectively, whereby operation of said trigger to cause disengagement of said first and second latch members and engagement of said third and fourth latch members effects automatic movement of the door to the closed position thereof and operation of said trigger to cause disengagement of said third and fourth latch members effects automatic movement of the door to the open position thereof and operation of said trigger to cause engagement of said first and second latch members effects holding of the door in the open position thereof.

26. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, first latch mechanism having a doorbar-holding condition for holding the door in the position thereof corresponding to the open position of the door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of the door, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to the door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with the door, a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the deviceconnecting condition and the device-holding condition thereof, and a control element for said mechanism disposed in front of the door-receiving opening and operatively connected to said trigger to activate said trigger in response to operation of said control element upon a wheeled vehicle entering into or exiting from the associated building, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of the door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of the door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of the door in the open position thereof.

27. A door control mechanism for use with a door mounted in an associated building having a door-receiving opening therein to accommodate a manual movement of the door from a first position to a second position thereof followed by an automatic movement of the door from the second position to the first position thereof under the urging of a biasing means and then by an automatic movement of the door from the first position to the second position thereof and then by a manual movement of the door from the second position thereof to the first position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, first latch mechanism having a doorbar-holding condition for holding said door bar in the position thereof corresponding to the open position of said door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the deviceconnecting condition and the device-holding condition thereof, means biasing said trigger into a first position for operating said first latch mechanism into the door-bar-holding condition thereof and said second latch mechanism into the device-connecting condition thereof, movement of said door bar to the position thereof corresponding to the open position of the door moving said trigger against said biasing means into a second position for operating said first latch mechanism into the door-bar-releasing condition thereof and said second latch mechanism into the device-holding condition thereof, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the open position thereof and operation of said trigger to cause selective operation of said latch mechanism to the door-barreleasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of said door in the open position thereof.

28. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, said door control mechanism including a control element therefor disposed in front of the doorreceiving opening, said door control mechanism in the closed 

1. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a door mounted in the door-receiving opening and movable between a first position and a second position with respect to the opening, counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the first position thereof, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the first and the second positions thereof, first latch mechanism having a doorbar-holding condition for holding said door bar in the position thereof corresponding to the second position of said door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the first position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the first position thereof to the second position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the first position to the second position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, whereby selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the second position thereof and selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the first position thereof.
 2. The combination set forth in claim 1, wherein said first position of said door is a closed position with respect to the opening and said second position of said door is an open position with respect to the opening.
 3. The combination set forth in claim 1, wherein said door-driving device includes a mass of sufficient weight automatically to move said door from the first position thereof to the second position thereof when operatively connected to said door.
 4. The combination set forth in claim 1, wherein said door-driving device bears against said door bar when said second latch mechanism is in the device-connecting condition thereof.
 5. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a door mounted in the door-receiving opening and movable between a first position and a second position with respect to the opening, counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the first position thereof, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the first and the second positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding said door in the second position thereof and disengagement of said first and second latch members releasing said door for movement to the first position thereof, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the first position thereof to the second position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with said door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with said door, whereby disengagement of said first and second latch members together with engagement of said third and fourth latch members effects automatic movement of said door to the first position thereof and disengagement of said third and fourth latch members effects automatic movement of said door to the second position thereof and engagement of said first and second latch members holding said door in the second position thereof.
 6. The combination set forth in claim 5, wherein said second latch member is pivotable between an engagement position with said first latch member and a disengagement position with said first latch member.
 7. The combination set forth in claim 5, wherein said fourth latch member is pivotable between an engagement position with said third latch member and a disengagement position with said third latch member.
 8. The combination set forth in claim 5, wherein said second latch member and said fourth latch member are pivotable about a common axis.
 9. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door moUnted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, first latch mechanism having a door-bar-holding condition for holding said door bar in the position thereof corresponding to the open position of said door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, whereby selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the open position thereof and selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof.
 10. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding said door in the open position thereof and disengagement of said first and second latch members releasing said door for movement to the closed position thereof, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with said door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with said door, whereby disengagement of said first and second latch members together with engagement of said third and fourth latch members effects automatic movement of said door to the closed position thereof and disengagement of said third and fourth latch members effects automatic movement of said door to the open position thereof and engagement of said first and second latch members holding said door in the open position thereof.
 11. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, first latch mechanism having a door-bar-holding condition for holding said door bar in the position thereof corresponding to the open position of said door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, and a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the device-connecting condition and the device-holding condition thereof, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of said door in the open position thereof.
 12. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding said door in the open position thereof and disengagement of said First and second latch members releasing said door for movement to the closed position thereof, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with said door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with said door, a trigger selectively operable on said second and fourth latch members to move said second and fourth latch members into and out of engagement with said first and third latch members respectively, whereby operation of said trigger to cause disengagement of said first and second latch members and engagement of said third and fourth latch members effects automatic movement of said door to the closed position thereof and operation of said trigger to cause disengagement of said third and fourth latch members effects automatic movement of said door to the open position thereof and operation of said trigger to cause engagement of said first and second latch members effects holding of said door in the open position thereof.
 13. The combination set forth in claim 12, wherein said trigger is positioned between said second and fourth latch members.
 14. The combination set forth in claim 12, wherein said second latch member and said fourth latch member each have an opening therein respectively to receive a portion of said trigger.
 15. The combination set forth in claim 12, wherein said trigger has extending therefrom two outwardly disposed cams, said cams extending at an angle of about 180* from each other, said trigger being positioned between said second and said fourth latch members, said second and said fourth latch members each having therein an opening respectively to receive a cam extending outwardly from said trigger.
 16. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, first latch mechanism having a door-bar-holding condition for holding said door in the position thereof corresponding to the open position of said door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectIvely operable on said second latch mechanism for operating said second latch mechanism between the device-connecting condition and the device-holding condition thereof, and a control element for said mechanism disposed in front of the door-receiving opening and operatively connected to said trigger to activate said trigger in response to actuation of said control element upon a wheeled vehicle entering into or exiting from the associated building, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of said door in the open position thereof.
 17. The combination set forth in claim 16, wherein said control element is hydraulically operated, thereby to activate said trigger in response to movement of hydraulic fluid in said control element.
 18. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, first latch mechanism having a door-bar holding condition for holding said door bar in the position thereof corresponding to the open position of said door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the device-connecting condition and the device-holding condition thereof, means biasing said trigger into a first position for operating said first latch mechanism into the door-bar-holding condition thereof and said second latch mechanism into the device-connecting condition thereof, movement of said door bar to the position thereof corresponding to the open position of said door moving said trigger against said biasing means into a second position for operating said first latch mechanism into the door-bar-releasing condition thereof and said second latch mechanism into the device-holding condition thereof, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatiC movement of said door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of said door in the open position thereof.
 19. The combination for use with an associated building having a door-receiving opening therein, said combination comprising a one-piece door mounted in the door-receiving opening and shiftable and pivotable between a closed position and an open position with respect to the opening, a counterbalance mechanism for mounting on the associated building adjacent to the door-receiving opening to counterbalance said door so that said door is biased toward the closed position thereof under the urging of gravity, a door control mechanism for mounting on the associated building and including a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to said door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of said door between the closed and the open positions thereof, said door control mechanism including a control element therefor disposed in front of the door-receiving opening, said door control mechanism in the closed position of said door accommodating both manual opening of said door and automatic opening of said door by actuation of said control element, said door control mechanism in the open position of said door accommodating both manual closing of said door and automatic closing of said door by actuation of said control element after a manual opening of said door, said door control mechanism including means for rendering any actuation of said control element ineffective to change the position of said door subsequent to an automatic opening thereof.
 20. A door control mechanism for use with a door mounted in an associated building having a door-receiving opening therein to accommodate a manual movement of the door from a first position to a second position thereof followed by an automatic movement of the door from the second position to the first position thereof under the urging of a biasing means and then by an automatic movement of the door from the first position to the second position thereof and then by a manual movement of the door from the second position thereof to the first position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the first and the second positions thereof, first latch mechanism having a door-bar-holding condition for holding the door in the position thereof corresponding to the second position of the door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the first position of the door, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the first position thereof to the second position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to the door to effect automatic operation thereof from the first position to the second position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with the door, whereby selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of the door to the second position thereof and selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the devIce-holding condition thereof effects automatic movement of the door to the first position thereof.
 21. A door control mechanism for use with a door mounted in an associated building having a door-receiving opening therein to accommodate a manual movement of the door from a first position to a second position thereof followed by an automatic movement of the door from the second position to the first position thereof under the urging of a biasing means and then by an automatic movement of the door from the first position to the second position thereof and then by a manual movement of the door from the second position thereof to the first position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the first and the second positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding the door in the second position thereof and disengagement of said first and second latch members releasing the door for movement to the first position thereof, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the first position thereof to the second position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with the door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with the door, whereby disengagement of said first and second latch members together with engagement of said third and fourth latch members effects automatic movement of the door to the first position thereof and disengagement of said third and fourth latch members effects automatic movement of the door to the second position thereof and engagement of said first and second latch members holding the door in the second position thereof.
 22. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, first latch mechanism having a door-bar-holding condition for holding said door bar in the position thereof corresponding to the open position of the door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of the door, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to the door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding conditIon for maintaining said door-driving device out of operative connection with the door, whereby selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of the door to the open position thereof and selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of the door to the closed position thereof.
 23. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding the door in the open position thereof and disengagement of said first and second latch members releasing the door for movement to the closed position thereof, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with the door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with the door, whereby disengagement of said first and second latch members together with engagement of said third and fourth latch members effects automatic movement of the door to the closed position thereof and disengagement of said third and fourth latch members effects automatic movement of the door to the open position thereof and engagement of said first and second latch members holding the door in the open position thereof.
 24. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, first latch mechanism having a door-bar-holding condition for holding said door bar in the position thereof corresponding to the open position of the door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position oF the door, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to the door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with the door, and a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the device-connecting condition and the device-holding condition thereof, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of the door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of the door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of the door in the open position thereof.
 25. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, a first latch member fixedly connected to said door bar for movement therewith, a second latch member mounted adjacent to said door bar for engagement with said first latch member, engagement of said first and second latch members holding the door in the open position thereof and disengagement of said first and second latch members releasing the door for movement to the closed position thereof, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, a third latch member mounted on said door-driving device for movement therewith, a fourth latch member mounted adjacent to said door-driving device for engagement with said third latch member, engagement of said third and fourth latch members holding said door-driving device out of operative connection with the door and disengagement of said third and fourth latch members placing said door-driving device in operative connection with the door, a trigger selectively operable on said second and fourth latch members to move said second and fourth latch members into and out of engagement with said first and third latch members respectively, whereby operation of said trigger to cause disengagement of said first and second latch members and engagement of said third and fourth latch members effects automatic movement of the door to the closed position thereof and operation of said trigger to cause disengagement of said third and fourth latch members effects automatic movement of the door to the open position thereof and operation of said trigger to cause engagement of said first and second latch members effects holding of the door in the open position thereof.
 26. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, first latch mechanism having a door-bar-holding condition for holding the door in the position thereof corresponding to the open position of the door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of the door, a door-driving device for said control mechanism and operative when connected to the door automatically to move the door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to the door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with the door, a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the device-connecting condition and the device-holding condition thereof, and a control element for said mechanism disposed in front of the door-receiving opening and operatively connected to said trigger to activate said trigger in response to operation of said control element upon a wheeled vehicle entering into or exiting from the associated building, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of the door to the open position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of the door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of the door in the open position thereof.
 27. A door control mechanism for use with a door mounted in an associated building having a door-receiving opening therein to accommodate a manual movement of the door from a first position to a second position thereof followed by an automatic movement of the door from the second position to the first position thereof under the urging of a biasing means and then by an automatic movement of the door from the first position to the second position thereof and then by a manual movement of the door from the second position thereof to the first position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positioNs thereof, first latch mechanism having a door-bar-holding condition for holding said door bar in the position thereof corresponding to the open position of said door and a door-bar-releasing condition permitting movement of said door bar to the position thereof corresponding to the closed position of said door, a door-driving device for said control mechanism and operative when connected to said door automatically to move said door from the closed position thereof to the open position thereof, second latch mechanism having a device-connecting condition for connecting said door-driving device to said door to effect automatic operation thereof from the closed position to the open position thereof and having a device-holding condition for maintaining said door-driving device out of operative connection with said door, a trigger selectively operable on said first latch mechanism for operating said first latch mechanism between the door-bar-holding condition and the door-bar-releasing condition thereof and selectively operable on said second latch mechanism for operating said second latch mechanism between the device-connecting condition and the device-holding condition thereof, means biasing said trigger into a first position for operating said first latch mechanism into the door-bar-holding condition thereof and said second latch mechanism into the device-connecting condition thereof, movement of said door bar to the position thereof corresponding to the open position of the door moving said trigger against said biasing means into a second position for operating said first latch mechanism into the door-bar-releasing condition thereof and said second latch mechanism into the device-holding condition thereof, whereby operation of said trigger to cause selective operation of said second latch mechanism to the device-connecting condition thereof effects automatic movement of said door to the open position thereof and operation of said trigger to cause selective operation of said latch mechanism to the door-bar-releasing condition thereof and said second latch mechanism to the device-holding condition thereof effects automatic movement of said door to the closed position thereof and operation of said trigger to cause selective operation of said first latch mechanism to the door-bar-holding condition thereof effects holding of said door in the open position thereof.
 28. A door control mechanism for use with a one-piece door mounted in an associated building having a door-receiving opening therein and shiftable and pivotable with respect thereto to accommodate a manual movement of the door from a closed position to an open position thereof followed by an automatic movement of the door from the open position to the closed position thereof under the urging of a biasing means and then by an automatic movement of the door from the closed position to the open position thereof and then by a manual movement of the door from the open position to the closed position thereof, said door control mechanism comprising a door bar pivotally mounted adjacent to the door-receiving opening and pivoted to the door for pivotal movement with respect thereto and for pivotal movement therewith in response to movement of the door between the closed and the open positions thereof, said door control mechanism including a control element therefor disposed in front of the door-receiving opening, said door control mechanism in the closed position of the door accommodating both manual opening of the door and automatic opening of the door by actuation of said control element, said door control mechanism in the open position of the door accommodating both manual closing of the door and automatic closing of the door by actuation of said control element after a manual opening of the door, said door control mechanism including means for rendering any actuation of said control element ineffective to change the position of the door subsequent to an automatic opening thereof. 